The southern lobe and hotspot show a polarization structure typical of double-lobed sources [1]} with the B-fields being perpendicular to the jet in the hotspot. The southern lobe and hotspot also show greater depolarization compared to the northern one. This is consistent with the northern jet/lobe being the approaching side and the southern lobe emission passing through a greater depolarizing medium, consistent with the `Laing-Garrington effect' [2]}, [3]}. Indeed, the presence of copious amounts of hot X-ray emitting gas has been observed surrounding the lobes of 3C390.3 in Chandra observations [4]}. This is also consistent with the presence of the one-sided parsec-scale jet pointing towards the north-western lobe in the 15 GHz VLBI image of [5]}.
